Dyno: Ford 1.0-liter EcoBoost 3-Cylinder Proves Less is Better
Ford Fiesta’s come standard with a 1.6-liter four-cylinder engine, but an optional 1.0-liter EcoBoost three-cylinder engine was available starting from the 2014 model year if you checked off the $995 option. But, both motors deliver similar amounts of power so why should you spend the extra grand?
To find out, I took a 2014 Fiesta SFE to Drift-Office in Auburn, Wash. to use its vehicle dynamometer (dyno) to highlight the intricate details of the tiny blown mill.
|Fiesta||Fiesta SFE||Fiesta ST|
|Engine||1.6-liter I4||1.0-liter Turbo I3||1.6-liter Turbo I4|
|Horsepower||120hp @ 6,350 RPM||123 hp @ 6,000 RPM||197 hp @ 6,350 RPM|
|Torque||112 lb.-ft. @ 5,000 RPM||125 lb.-ft. @ 2,500 RPM||202 lb.-ft. @ 4,200 RPM|
The $995 option only nets you an extra 3 hp and 13 ft.-lb of peak power, which doesn’t seem worth it, on paper. However, the power band reveals the benefits of turbocharging – instant torque and a power band that mimics the sportier Fiesta ST, albeit with less power.
I was only able to test the Fiesta SFE and ST on the dyno. A regular 1.6-liter naturally aspirated four-cylinder wasn’t available, unfortunately.
Despite Ford’s rating of peak power at 2,500 RPM, the three-cylinder EcoBoost reaches peak torque at around 2,200 RPM and holds steady until red line for a flat torque curve. A typical naturally aspirated motor generates torque in a linear upward manner that gradually increases the higher the engine revs, which is similar to the horsepower line on the graph.
So with the Ecoboost 3-cylinder, you aren’t just gaining 13 lb.-ft. of torque, but also reaching peak torque in half the revs. High horsepower looks great on paper, but torque is what gets the car going. In city traffic, the Ecoboost three-cylinder’s low-end torque makes the Fiesta a lot peppier when you mash the gas pedal.
Ford’s 1.0-liter EcoBoost three-cylinder piqued my interest because I’m a big fan of low-end torque. The Fiesta SFE is a joy to drive and I only wish it was available with the ST suspension for a thrilling yet fuel-efficient solution. Plus the 31, 43 and 36 mpg in the city, highway and combined is a healthy boost from the 28, 36 and 31 mpg of the regular 1.6-liter so you get more MPG and smiles-per-gallon.Read More